Squirrelmail Hangs

I am on a new dedicated server with Centos 5.5, Linux/Apache and WHM 11.28.52

Almost everytime I login, Squirrelmail hangs.
By hang, I mean I see a white page instead of the greeting screen with a squirrel holding mail.
The Apache headers say HTTP/1.1 304 Moved ... assuming that should automatically redirect. It doesn't.
I have to hit reload on my browser 2-3 times in order to get where I wanted to go; once I'm there, everything works as expected.

Tonight, for the first time since this all started, the same thing happened after I clicked "Logout" too.

It's more of a minor annoyance than anything, but is there any way to fix it?